Catalytic Enantioselective Intramolecular Oxa-Michael Reaction to α,β-Unsaturated Esters and Amides
作者:Guanglong Su、Michele Formica、Ken Yamazaki、Trevor A. Hamlin、Darren J. Dixon
DOI:10.1021/jacs.3c03182
日期:2023.6.14
bifunctional iminophosphorane (BIMP)-catalyzed, enantioselective intramolecular oxa-Michael reaction of alcohols to tethered, low electrophilicity Michael acceptors is described. Improved reactivity over previous reports (1 day vs 7 days), excellent yields (up to 99%), and enantiomeric ratios (up to 99.5:0.5 er) are demonstrated. The broad reaction scope, enabled by catalyst modularity and tunability, includes
描述了双功能亚氨基正膦 (BIMP) 催化的醇与束缚的低亲电性 Michael 受体的对映选择性分子内 oxa-Michael 反应。与之前的报告相比,反应性有所提高(1 天与 7 天相比)、优异的产率(高达 99%)和对映体比率(高达 99.5:0.5 er)。由于催化剂的模块化和可调性,反应范围广泛,包括取代的四氢呋喃 (THF) 和四氢吡喃 (THP)、氧杂螺环、糖和天然产物衍生物、二氢-(异)-苯并呋喃和异苯并二氢吡喃。最先进的计算研究表明,对映选择性源于 BIMP 催化剂和基材之间存在的几个有利的分子间氢键,从而诱导稳定的静电和轨道相互作用。